Piston ring



ZMQLMQ May M, 1935.. Y H. F. BEDWELL PISTON RING Filed Feb. 16, 1954Patented May 14, 1935 PISTON RING Harry Francis Bedwell, Lyons, Ind.Application February 16, 1934, Serial No. 711,582

1 Claim.

This invention relates to an oil ring for use in connection with thepiston of an internal combustion engine. It is an object of theinvention to provide a ring with a single scraping edge which willremain constantly in contact with the cylinder wall so as to insureeflicient scraping of the lubricant therefrom.

A further object is to provide a ring of this character which will notchoke with carbon and which has means whereby the oil accumulated by thering can be returned freely into the piston so that all carbon and otherforeign accumulations will flow from the outer surface of the ringwithout danger of choking the ring and interfering with the return ofthe oil to the crank case.

A still further object is to provide an oil ring the use of which willresult in a considerable saving of lubricant.

With the foregoing and other objects in View which will appear as thedescription proceeds, the invention consists of certain novel details ofconstruction and combinations of parts hereinafter more fully describedand pointed out in the claim. In-the accompanying drawing the preferredform of the invention has been shown.

In said drawing:

Figure 1 is a transverse section through a portion of an engine cylinderand the piston therein, said piston being equipped with an oil ring suchas constitutes the present invention, the ring being partly in sectionand partly in plan.

Figure 2 is a view partly in side elevation and partly in section of theoil ring.

Figure 3 is an enlarged. section on line 3-3, Figure 1.

Figure 4 is an enlarged section Figure 1.

Referring to the figures by characters of reference A designates thecylinder of an internal combustion engine in which is mounted areciprocating piston 3 provided with the usual oil groove C extendingtherearound. This groove is of uniform width and depth and has aplurality'of closely arranged drain openings D leading therefrom to theinterior of the piston.

The ring constituting the present invention has been indicated at I andis formed of resilient metal with its ends 2 adapted to lie closetogether when the ring is seated in the groove C. The other side of thering is cut away to form an annular rabbet 3 open at the bottom. Theupper wall of this rabbet is inclined downwardly and on line 4-4,

outwardly-as indicated at 4 and terminates in a scraping edge 5 forcontact with the surface-of cylinder A.

Extending longitudinally of the rabbet 3 and opening thereinto at thecenter of the ring are drain slots 6. The end walls of these slotsdiverge inward toward the piston. Thus it is possible to arrange theslots close together and at the same time have their inner or outletsides of such length as to communicate at one time with the maximumnumber of drain openings D. This will be apparent by referring to Figurel.

The back wall of the rabbet 3 is inclined downwardly and outwardly fromthe inner end of wall 4 to the slots 6 and, if .desired, a shallowchannel 8 can be formed in the outer surface of the ring between and inline with the slots 6.

In practice the scraping edge 5 will remain constantly in contactwiththe surface of the cylinder, itstendency to hug said surface beingdue to the fact that only one scraping edge is provided. Consequentlythere is no tendency of this scraping edge 5 toswing away from the wallas would be the case should another scraping edge be located adjacent to'the bottom'of the rmg.

As the piston moves in one direction the edge 5 will scrape the oil fromthe cylinder wall and deposit it in the rabbet 3. The inclined walls 4and 1 increase the size of the oil receiving space so that the flow ofoil will not be retarded. The flow is also expedited in view of the factthat the slots 6 increase in length toward their inner or outlet sideswherethey are in constant communication with the maximum number of drainopenings D.

Because of the free flowing action of the oil from the ring back intothe piston due to the ample space provided for its accumulation and forits return .to the piston and thence to the crank case, the oil does nothave an opportunity to choke the ring with carbon. Instead any smallamounts of carbon which might form will be carried ofi with otherimpurities and be deposited in the crank case.

As the scraping edge 5 is maintained in constant correct scrapingposition, the use of this ring will result in a considerable saving ofoil which might otherwise be wastedand the saving is further promotedthrough the free return of the oil to the crank case before it cancarbonize.

By providing the channels 8 some of the 'oil flowing downwardly alongthe wall of the rabbet will be deflected toward the slots 6.

What is claimed is:

from the rabbet, that portion of the wall of the rabbet between theslots and the wall being inclined downwardly and outwardly to provide anoil receiving space of increased area between the slots and the scrapingedge, there being channels in those portions of the wall of the rabbetbetween the slots and terminating at the ends of the slots for trappingoil and deflecting it to the slots.

HARRY FRANCIS BEDW'ELL.

